A source of market liquidity that is held in the form of blocks (block holdings) by institutional investors in their portfolios. The blocks of shares or bonds or other instruments may be available for sale, but without active marketing efforts. Latent liquidity may find its way to the market by brokers, who approach investors to probe their willingness to sell their holdings, partially or wholly.

This measure of liquidity reflects the liquidity of securities that infrequently trade.